[PATCH] mtd: spinand: winbond|toshiba: Fix ecc_get_status

From: Olivier Maignial
Date: Tue Jun 20 2023 - 17:16:38 EST


Reading ECC status is failing in toshiba & winbond spi-nand drivers.

tx58cxgxsxraix_ecc_get_status() and w25n02kv_ecc_get_status()
functions are using on-stack buffers which are not suitable
for DMA needs of spi-mem.

Fix this by using the spi-mem operations dedicated buffer
spinand->scratchbuf

See
spinand->scratchbuf:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/mtd/spinand.h?h=v6.3#n418
spi_mem_check_op():
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-mem.c?h=v6.3#n199

Signed-off-by: Olivier Maignial <olivier.maignial@xxxxxxxxxx>
---
drivers/mtd/nand/spi/toshiba.c | 4 ++--
drivers/mtd/nand/spi/winbond.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
index 7380b1ebaccd..a80427c13121 100644
--- a/drivers/mtd/nand/spi/toshiba.c
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -73,7 +73,7 @@ static int tx58cxgxsxraix_ecc_get_status(struct spinand_device *spinand,
{
struct nand_device *nand = spinand_to_nand(spinand);
u8 mbf = 0;
- struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
+ struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, spinand->scratchbuf);

switch (status & STATUS_ECC_MASK) {
case STATUS_ECC_NO_BITFLIPS:
@@ -92,7 +92,7 @@ static int tx58cxgxsxraix_ecc_get_status(struct spinand_device *spinand,
if (spi_mem_exec_op(spinand->spimem, &op))
return nanddev_get_ecc_conf(nand)->strength;

- mbf >>= 4;
+ mbf = *(spinand->scratchbuf) >> 4;

if (WARN_ON(mbf > nanddev_get_ecc_conf(nand)->strength || !mbf))
return nanddev_get_ecc_conf(nand)->strength;
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 3ad58cd284d8..f507e3759301 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -108,7 +108,7 @@ static int w25n02kv_ecc_get_status(struct spinand_device *spinand,
{
struct nand_device *nand = spinand_to_nand(spinand);
u8 mbf = 0;
- struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
+ struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, spinand->scratchbuf);

switch (status & STATUS_ECC_MASK) {
case STATUS_ECC_NO_BITFLIPS:
@@ -126,7 +126,7 @@ static int w25n02kv_ecc_get_status(struct spinand_device *spinand,
if (spi_mem_exec_op(spinand->spimem, &op))
return nanddev_get_ecc_conf(nand)->strength;

- mbf >>= 4;
+ mbf = *(spinand->scratchbuf) >> 4;

if (WARN_ON(mbf > nanddev_get_ecc_conf(nand)->strength || !mbf))
return nanddev_get_ecc_conf(nand)->strength;
--
2.34.1